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x in (-oo:+oo)
x+28 = x/7+2 // - x/7+2
x-(x/7)-2+28 = 0
6/7*x+26 = 0 // - 26
6/7*x = -26 // : 6/7
x = -26/6/7
x = -91/3
x = -91/3
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